# tmux.WindowOptionValues.MainPaneWidth

- **Module:** tmux.WindowOptionValues
- **Package:** github.com/libtmux/libtmux-go/tmux
- **Language:** Go
- **Kind:** method
- **Source:** https://github.com/libtmux/libtmux-go/blob/5f808882015a975a65acc7f9da5b3ff0d5cbdc91/tmux/option_generated.go#L2620
- **Page:** https://libtmux.org/reference/go/tmux-windowoptionvalues-mainpanewidth/

```
tmux.WindowOptionValues.MainPaneWidth() -> OptionValue[string]
```

MainPaneWidth returns materialized "main-pane-width" as [OptionValue] with value type OptionValue[string] from window option values; it does not query tmux. Available as STRING since tmux 3.2a; set it with [Window.SetMainPaneWidth] or [GlobalWindowScope.SetMainPaneWidth].